The invention discloses a multistage water purifier with an
ultraviolet sterilization device and a manufacturing method. The multistage water purifier is further provided with an
ultrafiltration membrane filter device. The top of an upper
valve seat of the
ultrafiltration membrane filter device is provided with a spiral hole to which a dust cover is fixed, a lower opening of an upper
valve seat is provided with a spiral internal thread opening, and an upper opening of a
barrel is provided with a spiral external thread opening and a first
silicon rubber sealing ring. An upper round clamping
pipe into which a middle connecting
pipe is inserted is arranged in the center of the upper
valve seat, a lower round clamping
pipe is arranged at the bottom of the
barrel, and the upper round clamping pipe and the lower round clamping pipe can effectively fix the middle connecting pipe. The
upper segment of the middle connecting pipe is sleeved with a
filter element shell and a filter component composed of multiple filter
layers, a groove in the outer wall of the
filter element shell is provided with a second
silicon rubber sealing ring, and a
far infrared mineralized stone filter layer, a KDF55 filter layer, a
residual chlorine purification stone filter layer and a
fiber filter layer are sequentially arranged in the
filter element shell from bottom to top. The lower segment of the middle connecting pipe is sleeved with an
ultrafiltration membrane filter element. The left side of the upper valve seat is provided with a water inlet, and the right side of the upper valve seat is provided with a water outlet.